Thanks for the answers! It is a little daunting seeing a 23 page thread on model making, so it is good to hear that it is not normally difficult.
Here is a follow question. Has anybody run the ASCOM conformance checker https://www.ascom-st...ds/DevTools.htm on the 10micron driver?
Here is why I ask. For whatever reason, I found a ton of software and hardware bugs in the mounts I have used so far.
The Avalon M-zero was unusable for the first three months I had it. Then I found that much of the problem was due to the fact that its driver would not pass ASCOM conformance test. Avalon, to their credit, did fix those bugs when I insisted, but it seemed strange to me that the would even release a product that wouldn't pass the test. There was also a serious bug in the controller hardware.
Now, my M-zero works well, but it was a frustrating several months.
I also use a Rainbow RST 135. That also has very serious bug. And, it turned out that the Rainbow driver also would not initially pass the ASCOM conformance test. Rainbow is still tracking down the bug - the side-of-pier indication will sometimes flip for no reason - i.e. it acts as if a meridian flip occurred, but there was no flip. This causes PHD2 to guide in the wrong direction. Sure enough, the one error that the Rainbow driver gets in the ASCOM test relates to side-of-pier. This does not happen every observing night, but when it happens it is of course frustrating when it does, particularly because I haven't found any way to diagnose that it occurred.
So, my Rainbow almost works, and hopefully will will fully work soon, again, after frustrating several months.
I thought that I was safe buying either of those two mounts because they are widely used and seem to have good reputations on the forum.
Admittedly, my astrophotography so far has been a bit unusual - I have been making large mosaics with long programmed sequences of more than 100 positions in a night. (using NINA). That is all within what the mounts should be capable of but is probably a weird usage pattern.
Yet the fact is that both of these manufactures had released drivers that would not pass the ASCOM conformance test.
10micron seems to have very enthusiastic users and a great quality reputation (which it ought to have for the price!).
But before I embark on another journey doing remedial quality assurance the manufacturer should have done, I am a little gunshy.